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Int 10 Fn 12 - Video - Alternate Function Select (vga, Mcga) - Gray-scal [V]
AH = 12h
BL = 33h
AL = new state
00h enable gray scale summing
01h disable gray scale summing
Return: AL = 12h if function supported
Desc: specify whether or not colors should be converted to gray scale when
palette or color registers are loaded
See Also: AX=101Bh,AX=BF06h,AX=BF08h
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